This issue is resolved in VMware NSX Data Center for vSphere 6.4.7, available at
VMware Downloads .
Workaround:
Delete the event log server and then re-add it via API as below.
POST /api/1.0/directory/updateEventLogServerRequest Body:
<EventlogServer>
<domainId>1</domainId>
<hostName>eventlog_server_1.abc.com</hostName>
<enabled>true</enabled>
</EventlogServer>(You can retrieve the domain id used above from
GET /api/1.0/directory/listDomains.)
The API response should correctly show WIN2K8 in serverType, and you can also confirm it is WIN2K8 in GUI.